Auxiliary air inlet for internal-combustion engines



NOV- 27, u

P. C. J. PAFFRATH AUXILIARY AIR INLET FOR INTERNAL COMBUSTION ENGINESFiled May 25 1922 jfg. 1

@9M/@74M @gdm GM `gen asse 2l,

Patented Nov. 27, 1923.

PAUL CARL JEAN PAFFBLTH, OALTENBUBG, GERMANIA, ASSIGNOR OF TWO-THIRDS TRICHARD POCHWADT AND ARNO GUNZEL, BOTH 0F ALTENBURG, GERMANY.

LUXILIABY AIB INLET FOR INTERNKAL-COMBUSTION,ENGINES.

Application filed lay 25,

To all whom t may concern:

Be it known that I, PAUL CARL JEAN PAF- FRATH, citizen of Germany,residing at Altenburg, Sachsen-Altenburg, Germany, Lanhave inventedcertain new and use l Improvements in an Auxiliary Air Inlet forInternal-Combustion Engines, of which the following is a specification.

My invention relates to improvements in internal combustion engines, andmore particularly in engines, of the type in which means are providedfor admitting secondary air to the combustible mixture, and in whichthe`valve controllin the supply of secondary air is controlledlby thesuction transmitted from the cylinder or cylinders to the suction pipe.The object of the improvements is to provide means of this class whichare simple in construction and reliable in operation. With this objectin view my invention consists in providing, within a chambercommunicating with the suction pipe, a piston formed with a tubularportion extending into position for discharging secondary air into thesuction ipe, and providing at its inlet end a valve ody adapted to beset reiatively to a valve' seat according to the action of the suctionon the piston.

In order that my invention be more clearly understood an exampleembodying the same has been shown in the accompanying drawing, in whichthe same reference characters have been used in all the views toindicate corresponding parts. In said drawini,- ig. 1, is a sectionalview showmg a art of the suction pipe of an internal comustion engine,

Fig. 2, is a horizontal section taken on the line 2-2 or Fig. 1, and

Fig. 3, is a horizontal section taken on the line 3-3 of Fig. i.

In the example shown in the figures to the suction pipe c of theinternal combustion engine the reduced part b or' the cylinder a isscrewed, which is provided with a head h formed with holes g and a valveseat z'. Within the cylinder an annular piston d is mounted whichcarries a pipe e extending into the suction pipe and ormed withdiverging apertures through which secondary air is distribute anddischarged into the suction pipe. At the side opposite to they pi e ethe piston d is in the form of a valve b y 'i' cooperating with thevalve seat z'. Between 1922.- Serial No. 583,741.

the pipe e and the reduced portion b of the cylinder an annular passageb is provided t rough which the chamber o of the cylinder located abovethe piston d communicates with the suction ipe, lso that the piston d isacted upon b y t e vacuum within the suction pipe permitting the valve1I to be raised from its seat by the transmitted to the ower 4side ofthe piston through the holes g. Between the bottom face of the head z.and .a disk n adjustable on a screw-threaded spindle Z securedvto thetop end of the ipe e a spring m is interposed, which has t e tendency toforce the valve i on its seat t' against the action of the atmospheric`pressure and the vacuum acting on the piston d. Preferably the pipe eisformed with ribs k b means of which it is guided within the re uced partb of the cylinder a.

Theoperation of the apparatus is as follows: When starting the engine avacuum is produced within the suction pipe c which is transmittedthrough the annular pesage b' to the chamber o, so that the piston d. isforced upwards by the pressure of the outer air against the pressure ofthe spring m, and the valve i is unseated. Therefore, a certain amountof secondary air is admitted through the holes g and the pipe e, whichis discharged in a state of line distribution into the combustiblemixture flowing through the suction pipe c. The elevation of the valveand the volume of secondary air supplied te the combustible mixturedepend on the vacuum within the suction pipe c and on the number ofrevolutions or the engine. The elevation of the valve is regulatedaccording to the requirements of the en ine by setting the disk n on thespindie Z. he operation of the piston d is not interfered with by theflow of the secondary air through the same.

While in describing the invention reference has been made to aparticular example embodying the same, I wish it to be understood thatmy invention is not limited to the construction shown in the figures,and that various changes may be made in the General arrangement of theapparatus and t e construction of its parts without departing from theinvention.

I claim:

1. The combination with the intake conduit of an internal combustionengine, of a device for supplying auxiliary air to the ressure of theouter air combustible mixture owing therethrough, con'iprising acylinder attached to said conduit and opening therein, a piston in saidcylinder, an elongated hollow member proliecting from the suction faceof Said lpiston into said conduit, said hollow member being providedwith a plurality of perforations through that part which projects intosaid conduit, said piston having a central opening communicating, withthe interior of said member and terminating at the atmospheric sidethereof in an annular valve face, a perorated cap on said cylinderhaving a central boss forming a seat for said valve face, and yieldablemeans for holding said valve parts in closing relation. t

2. The combination with the intake conduitl of an internal combustionengine, of adevice for supplying auxiliary air to the combustiblemixture Howng therethrough, comprising a cylinder attached to saidconduit and communicating therewith, a piston in said cylinder, anelongated hollow member projecting from the suction side of said pistoninto said conduit, said hollow member being provided with a number ofsmall openings through that part which projects into said conduit, saidpiston having a central opening communicating with the interior" of saidhollow member and terminating at the atmosphericl side thereof in avalve face, a seat for said valve face atthrough said neck into saidconduit and hav-v ing a plurality of small openings in that part whichprojects in said conduit, Said member forming with said neck an annularpassage between said conduit and cylinder, the borevof said hollowthrough said piston and terminating in an annular valve face, aperforated cap on saidv cylinder having a central boss forming a, seatfor Said valve face, a stem attached to the upper end. of said hollowmember passing axially therethrough and through said boss and cylindercap, an abutment on said cylinder, and yieldable means c memberextendingr stemLand a coil'sprng between said abutnient and cylindercap. 1

In testimony whereof I affix my signature in presence of two witnesses.

PAUL CARL JEAN PAFFRATH. Witnesses:

t E. HoLsERMAN, R.- Y. AUsPAon.

